Improvement in sceoll-sawing machines



lstruction and' operation.

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IMPROVEMENT IN SGROLL-SAWING MACHINES.

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, H. L. BEACH, of thc city of New York, in the countyof New York, and State of New York, have invented a new and usefulImprovement in fScroll-Saws, and I do hereby .declare that the followingis a full and exact description thereof, reference being had to theaccompanying drawings, making a part of this specification, and to theletters of reference marked thereon, and in which Figure l is aperspective view of my scroll-saw. 'A

Figure 2, a front-elevation view of same.

Figure 3, a side-elevation view of the same.

Figure 4, an elevation view (on a somewhat larger scale) of the saw asconnected with its pitman, springs, ttc.

The nature of my invention consists in providing a scroll-saw of a cheapand simple construction, capable .of being adapted to any dimension oftimber, and which will do theyfork ata great saving of labor andmaterial, on account of its peculiarattachments, as hereinafterdescribed.

To enable others skilled in the art to make and use my invention, I willnow proceed to describe its coni A A is the upright frame, wooden ormetallic, into which my apparatus is set. T R is the table-rest, onwhich rests the timber to be sawed. C S and C' S are two shafts set onframe in a parallel position, both bearing on the inside end a crank, C-and C', and on the outside end pulleys P and P', connected by belt B androd R. Pitmen P I andfP" I are respectively attached to crank C and Oand to guides Gr and G', said guides having a sliding, Lip-and-downmovement along guide-rods Gr R and G R', iig. 4. It is well to remarkthat guide-rods G B. and Gr R are both set in an inclined position, sothat when guides G and7G' slide down, theirr motion is downward forward,and when sliding up it is upward backward. The head H of saw S isfastened 'to a third or middle guide, M G, set on similarly to theguides G and G', above described, and the saw is driven upwards byattachment A T, g.- 4, as follows: The end r` of vrod R' is fastened, byits lower end, to head of guide M Gr, and its upper (rod r') end isprovided with a thread on' which nut -N. sets. The upper end r' of rodR' runs into a barrel of a frame, F, as shown in iig. 4, into which aspiral spring, S P, is so placed that rod R runs through it. On 'the topof said' spiral spring is set plate L, made so that it slidesup and downbarrel or frame F, and is maintained in proper position by vnut N whichscrews on thread or head Aof rod R', as afore said. Said nut gives moreor less stiii'ness to spring SP. On the top plate of frame or barrel isa ring attached to it by a free swivel-rivet, and nut N beingpermanently attached or soldered on inside sliding plate P L, it will besuiiicient to turn the barrel or spring-frame, as the case may be, toact on nut N, and therefore stien or loosen the spring. Lastly,swivel-ring S R is fastened on to a slotted connecting-rod, C R, whichis itself fastened on to pin P G of the upper guide.

The saw runs through table T R, and has its lower end attached to headof guide G', which is itself con nected with crank C' by slotted pitmanP' I'. Pulley P" connects my machine with the power which is to act onit, and belt B, driven by belt on P", communicates the motion to lbothparallel cranks C S and C' S'. One can easily see that it is essentiallboth cranks C and C should work symmetrically. I therefore connect bothpulleys P and P with rod R, which has for its object to keep bothcranksy in the same relative position they ,Y

have been placed by the operator in the action of stiifening orloosening the saw; the screw arrangement S P A being for the purpose ofmodifying at will the length of rod R, so as to adapt it to the relativepositionsrof the cranks. Now pitman P' I', being slotted, pulls the sawdown, but cannot push it up, on account of the loss of Apower or motionresulting from the slot in P' I'. The same reasoning applies toconnectingrod C R, which can pull the saw up but cannot push it down.Therefore, should any of the two pinsV which hold the saw break, (aswill sometimes happen,) the saw, drawn up or down, will remain safe ineither position, and whatever be the speed at the timesof the break,because the pin in the opposite pitman will work without eiiect up anddown the slot in said pit-man. l It must also be remarked that the pitchwhich both upper and lower guides derive from the inclined position ofthe rods along which they slide up and down, gives the saw the neededforward movement when drawn down and backward when drawn up. v l

In the above description I have mentioned metallic or wooden pitmen andconnecting-rods slotted, and this is the most mechanical andworking-like mode to be adapted in a well-made machine; but in case ofneed, or for any other cause, reason, or notice, I mean to useleather'straps, ropes, or any other material that will answer mypurpose, viz, to draw the saw alternately up and down without, in anycase, pushing it up or down.

Having thus described my invention, its construction and operation, whatI do claim as my invention, and desire to secure by Letters Patent ofthe United States,ris-

1. The saw-straining spring arrangementNF S P, in its combination andrelative action with rod R', crank-shafts C S and C' S' and saw S, allconstructed in thc manner and for the purpose above set forth anddescribed.

2. The combination of saw S, guides G, M G, and G', rod R', slidingguide-rods G R and G' 'fcr'anks C and C', crank-shafts C S and C' S',slotted pitman P'-I', and slotted connecting-rodC1 R, the wholecoinbiued, constructed, angl operating in the manner and for the purposeabove set forth and described.

H. L. BEACH. [IL s] Witnesses:

ALEX. DU FLoN, WILLIAM APPELGATE.

